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Dr. Timothy R. Koch received an M.D. degree from the University of Chicago, Pritzker School of Medicine, Chicago, IL. He then completed a residency and fellowships in internal medicine, gastroenterology, and gastrointestinal physiology at the Mayo Medical School in Rochester, MN. Dr. Koch has been on the faculty at the Medical College of Wisconsin in Milwaukee, WI and at the West Virginia University School of Medicine in Morgantown, WV. Since 2005, he has been Professor of Medicine (Gastroenterology) at Georgetown University School of Medicine in Washington, DC. His research program has been designed to evaluate the roles of micronutrients in colon disorders and in upper gastrointestinal function following bariatric surgery.